Time lag device



H. L. LAVEN TIME LAG DEVICE Feb. 7, 1933.

Filed June 24, 1931 8 m 5 5 n 7. 9 /k 6 V 3 m n L v m a H a a M Hzrris L Lav- 4 afte drawing Patented-Feb. 7, 1933 UNITED STATES PATENT -ornca Application am June :4, 1031. Serial Io. uuj'r.

bolt 19 bein v encircled between the contac- This invention relates to time lag devices useful in many arts but hereinafter shown as applied to the electrical art, to delay the closing of a circuit until a predetermined time r a certain incident or event has occurred.

The invention has for one of its objects the-provision of a mechanical device for producmg a time la instead of the usual electrical devicesan train of gears heretofore tively empl yed. he invention will be fully and comprehensivel understood from a consideration of the ollowing detailed description when read in connection with the accompanying which forms part of the application, with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawing nor to the precise 3 construction described and, therefore, such changes and modifications may be made therefrom as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claim.

In the drawing:

Fig. 1 is an elevational section, of m time lag device associated with the electric apparatus, the electrical apparatus bein shown in this figure in closed view, partly in so positlon; an

7 Fi 2 is a view similar to Fig. 1, the electricaf apparatus in this view being shown in open sltion.

Re erring to the drawing for a more detailed description thereof, the numeral 5 in J tEer dicates a panel with insulating material through which pass bolts 6 and 7, said bolts being in contact with and adapted to hold in cooperation with nuts 8, conductors 9 and 10, respectively, said conductors being part of an electrlcal circuit. Means for closing the mentioned electrical circuit comprises an arm 12 secured by means of rivets 13 to a lever 14 pivotally connected at 15 to a bracket 16 held to the panel 5 by means of the bolt 6. The arm 12 has an aperture 17 adjacent its upper end throu h which aperture asses a bolt 18 provide with a retainead 19 at one end and provided at its end with a contactor 20, the mentioned tor 20 and t e arm 12'by a helical coil 21 adapted to expand lengthwise, the aperture 17 being of greater diameter than the bolt 18 to allow for the movement of the bolt. The contactor 20 is adapted to contact with another contactor 22 carried by the bolt 7. When the contactor 20 touches the contactor 22 the mentioned electrical circuit is closed, said circuit including the conductor 9, the bolt 6, the bracket 16, the lever 14, the arm 12, the bolt 18, the contactors 20 and 22,-the bolt 7 and the conductor 10. The portion 23 of the lever 14 constitutes a movable core for a solenoid 24 draws or pulls in the core 23 and the arm 12 which is connected to said core, the core being pulled in sufiiciently to allow the contactors 20 and 22 to touch each other. The solenoid 24 may be provided with a stationary core 25 so that when the solenoid is energized the stationary core will insist on pulling in the movable core 23.

In order to delay the closing of the mentioned electrical circuit until a predetermined time after the solenoid 24 is energized I provide a time lag device com rising a movable bolt 26, the u per end of which passes through an elonga slot 27 formed in the end portion 28 of the arm 12, said portion 28 being bent at right angles to the main or intermediate section of the arm 12. The slot 27 is narrower than the retaining head 29 rovided at the top of the bolt 26 so that the mentioned head has a bearing surface on the mentioned portion 28, said elongated slot 27 bein longer than the diameter of the bolt 26 to a low movement of the portion 28 rel ative to the bolt, it being understood that the arm 12 swings from the pivot 15. The bolt which, when energized,

.turn in the nut when a longitudinal pull is exerted on the bolt. The threads of the mentioned bolt and nut are referably. not in contact with each other ut se arated by 'means of ball bearings 37 in or er to mimmize the friction between the bolt and the nut.

When the solenoid 24 is energized, the core 23 is pulled into the solenoid and the arm 12 moves toward the panel. 5; the contactors 20 and 22, however, do notimmediately contact with each other on account of the retarding action of the bolt 26. That is to say, the bolt 26 must be pulled upwardly a certain distancebefore the contactors 20 and 22 can touch each other, it being understood that the time lag or delay caused by the bolt 26 is due to the rotational motion which it is necessary for the bolt 26 to have.

What is claimed as new is:

The combination of a vertically swinging pivotally supported member adapted for controlling an electric switch, an outturned slotted ear on said member, a bracket fixedly mounted below said member and having a vertical extension directed toward said memher, an internally threaded nut carried by said bracket, a threaded bolt engaged in said nut and passed u wardly through the slotted ear, the threa s of said bolt and nut being of wide pitch, anti-friction bearin s interfitted with the threads of the nut an bolt, and a head on the bolt for positively conne'cting it with the slotted ear. y

In testimony whereof I hereby aifix my signature.

HARRIS L. LAVEN. 

